Abstract

Problem statement: The algebraic expression of the Advanced Encryptio n Standard (AES) RIJNDAEL S-box involved only 9 terms. The selected mapping for RIJNDAEL S-box has a simple algebraic expression. This enables algebraic manipu lations which can be used to mount interpolation attack. Approach: The interpolation attack was introduced as a crypt analytic attack against block ciphers. This attack is useful for cryptanalysis us ing simple algebraic functions as S-boxes. Results: In this study, we presented an improved AES S-box with good properties to improve the complexity of AES S-box algebraic expression with terms increasing to 255. Conclusion: The improved S-box is resistant against interpolation attack. We can deve lop the derivatives of interpolation attack using t he estimations of S-box with less nonlinearity.

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